Collapsible ground surface mat



FIG. 1 is a top perspective view of a collapsible ground surface mat, shown in a flat configuration;

FIG. 2 is a top perspective view thereof, shown in a folded configuration;

FIG. 3 is a top plan view thereof, shown in a flat configuration;

FIG. 4 is a left-side elevation view thereof, the right side view is a mirror image thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front elevation view thereof, the rear elevation view is a mirror image thereof.

The dashed lines in the figures depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for a collapsible ground surface mat, as shown and described. 